Table 6.7 — DRM_Alternate_Hierarchy_Related_Geometry

Property

Description

Class

  • <DRM Alternate Hierarchy Related Geometry>

Superclass

Subclass

  • None.

Definition

An instance of this DRM class specifies an aggregation of <DRM Geometry Hierarchy> instances, in which each <DRM Geometry Hierarchy> component is an alternate representation of the same environmental entity, and the corresponding <DRM Hierarchy Data> link object indicates why that particular alternate representation was provided.

Class diagram

Figure 6.6 — DRM_Alternate_Hierarchy_Related_Geometry

Inherited field elements

Field name

Range

Field data type

unique_descendants

 

Boolean

strict_organizing_principle

 

Boolean

Field elements

Field name

Range

Field data type

None

   

Default field values

Default field values for DRM_Alternate_Hierarchy_Related_Geometry

Associated to (one-way) (inherited)

Associated to (one-way)

  • None.

Associated by (one-way) (inherited)

Associated by (one-way)

  • None.

Associated with (two-way) (inherited)

  • None.

Associated with (two-way)

  • None.

Composed of (two-way) (inherited)

Composed of (two-way)

Composed of (two-way metadata) (inherited)

Composed of (two-way metadata)

  • None.

Component of (two-way) (inherited)

Component of (two-way)

  • None.

Constraints

Clarifications

1An association between a <DRM Feature Representation> instance and a <DRM Geometry Hierarchy> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

2An association between two <DRM Geometry Hierarchy> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

3An association between a <DRM Feature Representation> instance and a <DRM Geometry Hierarchy> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

4An association between two <DRM Geometry Hierarchy> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> link object on the association relationship.

5An association from a <DRM Hierarchy Summary Item> instance to a <DRM Geometry Hierarchy> instance indicates that the <DRM Hierarchy Summary Item> instance summarizes that <DRM Geometry Hierarchy> instance.

6An association from a <DRM Reference Surface> instance to a <DRM Geometry Hierarchy> instance indicates that the <DRM Geometry Hierarchy> instance organizes the geometric objects that specify the reference surface geometry of the <DRM Reference Surface> instance.

7In the case where multiple <DRM Collision Volume> components are specified for the <DRM Aggregate Geometry> instance, the union of the volumes thus specified is used in collision detection.

8A <DRM Aggregate Geometry> instance can have a <DRM LSR Transformation> component only when the <DRM Aggregate Geometry> instance is within the scope of an LSR 3D SRF.

Example(s)